diff --git a/packages/libnode-common/test/smoke.test.ts b/packages/libnode-common/test/smoke.test.ts
index a8aec2765..b3930d457 100644
--- a/packages/libnode-common/test/smoke.test.ts
+++ b/packages/libnode-common/test/smoke.test.ts
@@ -1,14 +1,20 @@
 // Loads a real libnode pack from a C program (smoke/smoke.c) the way the
 // scriptc runtime does. Packs are not built by the ordinary build, so this
 // runs only when SCRIPTC_LIBNODE names a pack directory (a CI artifact of
-// the libnode-packs workflow, or a local build:native output).
+// the libnode-packs workflow, or a local build:native output). CI's
+// fallback development pack (dev-pack.json) is not a package: it has no
+// package.json and may carry a different Node patch release, so it is
+// exercised by the Node island tests instead.
+import { existsSync } from "node:fs";
+import { join } from "node:path";
 import { describe, expect, test } from "vitest";
 import { verifyPack } from "../scripts/verify.mjs";
 import { expectedTranscript, runSmoke } from "../scripts/smoke.mjs";
 
 const pack = process.env["SCRIPTC_LIBNODE"];
+const isPackage = pack !== undefined && pack !== "" && existsSync(join(pack, "package.json"));
 
-describe.skipIf(pack === undefined || pack === "")("libnode pack smoke test", () => {
+describe.skipIf(!isPackage)("libnode pack smoke test", () => {
   test("the pack is complete", () => {
     expect(verifyPack(pack!)).toEqual([]);
   });
diff --git a/packages/libnode-darwin-arm64/package.json b/packages/libnode-darwin-arm64/package.json
index e94c84e53..8c91e25e2 100644
--- a/packages/libnode-darwin-arm64/package.json
+++ b/packages/libnode-darwin-arm64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/libnode-darwin-arm64",
-  "version": "0.4.1",
+  "version": "0.4.2",
   "private": true,
   "description": "Prebuilt Node.js shared library and scriptc bridge for Node islands on macOS arm64",
   "license": "SEE LICENSE IN LICENSE",
diff --git a/packages/libnode-darwin-x64/package.json b/packages/libnode-darwin-x64/package.json
index 6622effe9..796d5eb6a 100644
--- a/packages/libnode-darwin-x64/package.json
+++ b/packages/libnode-darwin-x64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/libnode-darwin-x64",
-  "version": "0.4.1",
+  "version": "0.4.2",
   "private": true,
   "description": "Prebuilt Node.js shared library and scriptc bridge for Node islands on macOS x64",
   "license": "SEE LICENSE IN LICENSE",
diff --git a/packages/libnode-linux-arm64-gnu/package.json b/packages/libnode-linux-arm64-gnu/package.json
index 50b1a8085..2b6e9b66f 100644
--- a/packages/libnode-linux-arm64-gnu/package.json
+++ b/packages/libnode-linux-arm64-gnu/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/libnode-linux-arm64-gnu",
-  "version": "0.4.1",
+  "version": "0.4.2",
   "private": true,
   "description": "Prebuilt Node.js shared library and scriptc bridge for Node islands on Linux arm64 glibc",
   "license": "SEE LICENSE IN LICENSE",
diff --git a/packages/libnode-linux-x64-gnu/package.json b/packages/libnode-linux-x64-gnu/package.json
index e533a5402..05e36bd1e 100644
--- a/packages/libnode-linux-x64-gnu/package.json
+++ b/packages/libnode-linux-x64-gnu/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scriptc/libnode-linux-x64-gnu",
-  "version": "0.4.1",
+  "version": "0.4.2",
   "private": true,
   "description": "Prebuilt Node.js shared library and scriptc bridge for Node islands on Linux x64 glibc",
   "license": "SEE LICENSE IN LICENSE",